Arasan 21.4 is available from https://www.arasanchess.org
Changes in Arasan 21.4:
1) Update to use latest Fathom library with 7-man tb support.
2) Use Fathom ranking API for tb moves at root.
3) Changes to extension logic.
4) Use IID score to improve eval value for pruning, as is done with
hash scores.
5) Change IID conditions.
6) Fixes to singular extension code and rewrite to make it simpler.
7) Allow pre-search pruning when in ProbCut search.
8) Adjust LMP pruning thresholds, use higher threshold for PV nodes.
9) Change material scoring for minors vs pawns. Re-tune params.
10) Clear killers for successor nodes in search (idea from Ethereal).
Plus book updates as usual.
I am measuring about +25 ELO compared to 21.3 but that is on my (arbitrary) scale where 21.3 about 2400; since the CCRL/CEGT ratings are higher I'd expect a little more gain on their rating scale.
--Jon
Arasan 21.4
Moderators: hgm, Rebel, chrisw
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jdart
- Posts: 4367
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- Location: http://www.arasanchess.org
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tmokonen
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- Full name: Tony Mokonen
Re: Arasan 21.4
A new version of Arasan always makes the day a little brighter. Thanks Jon.
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Dann Corbit
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Re: Arasan 21.4
Good news on a Tuesday!
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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jdart
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- Location: http://www.arasanchess.org
Re: Arasan 21.4
I noticed arasanx-64-bmi2.exe (BMI2 but non-NUMA build) was missing from the engine archive (arasan21.4.zip) so I updated it to include that.
--Jon
--Jon